All persons in this story involved in sexual situations are at least 18 years of age.
*****
God, that smell...
Katy was whimpering on her back, sprawled out on the foldout while I was busy between her legs eating her out. Truth be told, my dick was pretty well spent and it would take a lot to give my sister any cum tonight, but I could spend an eternity tasting and smelling her wonderful body.
At some point her hand reached down and her fingers ran through my hair. When she grabbed the back of my head and gently pulled at me to get my face closer to her genitals, I knew she was close to an orgasm. I knew her signals well, and they hadn't changed over the last three years. It was like we had never been separated and the sex hadn't ever stopped.
She cried out and thrashed a bit when I finally brought her off. My tongue was sliding roughly across her clit and danced everywhere on her cunt except for her steaming pussy hole. I was teasing her by staying away from it, even though it was one of her favorite things to have my tongue fill. I could never get much of it inside of her, but the idea that my mouth was plastered across her vagina really got her off.
She convulsed under my face and oozed cream onto my chin. I kept lapping at her delicious lips and kept my attention on her clit. I was purposely overwhelming her, and it was almost too much for her to bear. I was keeping her right on the edge of where pleasure became uncomfortable. Her moans were really sexy and though I was well spent, my dick was rock hard right now.
She sighed deeply and smiled down at me. "God, you're good at that."
I smiled back at her. "It's your smell, it drives me wild."
She giggled, a bit giddy after such a powerful orgasm. She was running her fingers through my hair as I continued softly licking her genitals, running my tongue from her clit down to her ass and back up.
"What does she think we're doing down here?" Katy asked finally, after taking a moment to savor the sensations I was giving her. She knew that Adrienne was beginning to have knowledge of our secret, and that our dream of being together again was close at hand. But she didn't know my wife like I did.
"She knows that we're talking about how we fooled around as kids," I replied, inhaling her scent deeply before sitting up and staring at her swollen pussy. "I think she's expecting that this is the conversation that will sort of tip the scales one way or another."
"Like, I'll either be upset, or into it?" Katy guessed.
I nodded, wiping my chin. "Yeah. I think it's a little premature still to think that I'd be able to convince you, but she's really hopeful."
Katy shrugged. "We could play it up a bit, maybe act like I'm against the idea for a short while but then I come around."
"We just don't have much time," I said, shaking my head. "You and Mom are supposed to be leaving in less than two days."
"That's plenty of time." Katy sat up on her elbows. "We'll tell Mom that you offered to let me move in with you, and I'll go back with her and get my stuff and come back in a day or two after that. Maybe you could come out and help."
I knew what that meant. Lots of time alone together fucking, being with her, helping her pack up and move, driving back while she jerked me off in the car, stopping for gas and fucking in the backseat...
"Adrienne might be ok with that," I said, thinking seriously about it. "But I think she should know by then that we're fucking."
Katy frowned. "You mean, tell her everything?"
I shook my head. "No, I just mean, we should play along with our little game and she should think that we fucked at least once."
Katy was reaching across the foldout and trying to get my shorts off. She had my dick out and was getting ready to suck it, no doubt to return the favor. I let her do what she pleased, but felt like I should warn her how much work it was going to take to make anything happen.
"I'll need your ass tonight," I explained. "Adrienne's sucked me off twice already today. I'll need it hard, too."
Katy nodded, almost indifferent to that information as if it didn't really matter. "No problem. It's all yours."
She took my penis into her mouth and I was reminded again of how much I loved her. She had sucked me off countless times, and knew just how I liked to be touched and stroked. Adrienne was skilled in her own way, but Katy had more experience with it.
As pleasurable as it was, I knew that the longer I wasn't fucking her, the more chance that I would get tired and lose my erection, even with her skilled mouth working me over. I grabbed her arm and spun her around until her ass was facing me. She reacted in unison, falling onto her face and reaching back with her hands to spread her ass. I leaned down to inhale her scent and slather her butt with saliva before going to town on her.
Her grunts filled the room, and would have been heard by anyone right outside if they happened to be there. I knew we were virtually alone though so I didn't see the harm. I had my cock halfway into her ass and was pounding her hard to get the rest in. If we didn't go slow and build up to it, we usually had to work to get it all inside of her body. Her butt liked to be played with and romanced in order to fully open up. But this got the job done too after enough force.
As I plowed into her ass doggystyle, Katy was looking back at me with the hottest expression of submission I had ever seen in her. It was a reminder that her body was mine to do with as I pleased, and even if it hurt her, which it didn't, she wouldn't say or do anything to stop me. She was all mine. I wanted so badly to say that the same was true of me, but I belonged to another so it wasn't the same. It wouldn't ever be the same, and yet somehow there was a solution to this dilemma that involved a very understanding wife and a perverted sister who was in love with me.
Finally Katy's expression broke and she grimaced. I thought I had hurt her finally with such a rough pounding, but she was actually climaxing. It surprised me, since I didn't ever remember her cumming from anal sex before without me fingering her clit. She still thrust back at me in sync with my thrusts, but she was definitely distracted from my pounding by her intense pleasure.
I was spurred on by that and felt like I would finally cum again, so I threw her on her back and lifted her legs so I had access to her asshole again. She watched helplessly as I aimed my thick cock at her butt and pushed it back inside of her. We both usually liked to watched my cock disappear into her as I fucked her, but this time I thrust deep into her rectum and leaned down to kiss her passionately.
Katy responded to my kiss with equal fervor. It was a totally romantic and loving moment between us, even though our sex was of the more perverted and depraved sort at the moment. Our movements were gentle and kind despite the fact that I was invading the wrong hole in a filthy display of sexual deviance. That really got me off for some reason, and I just knew I would be filling her gut with my cum at any moment.
We continued to kiss and fight each others' tongues with our own while I thrust in and out of her back door. Her soft moans and exhalations became animalistic grunts of instinctive willingness. Her body accepted me fully even though I was fucking her in the wrong place, where my penis shouldn't be according to nature. Her eyes were locked onto mine with a sparkle of intense love and passion even though our sex was dominating and somewhat one-sided. She shouldn't be getting pleasure from this obscene act, and yet she had and still was.
"Fuck me," Katy whispered between grunts. "Fill me up. Cum deep in my ass. Fuck that butthole, yes...that's it...take it, take it! Make that ass yours..."
She was getting me there faster than ever with this dirty talk. The hunger she displayed for me to invade her tight anus made me truly believe that I was making her feel good with this forbidden penetration. Combined with my overly sensitive penis from all of the action today, this was going to be one hell of an orgasm.
When it let loose finally, I was balls deep in her intestines and stretching her sphincter beyond anything it had ever endured before. I had never had my penis this far into her ass before. I nestled my face into her neck, and the sweet smell of her skin set off the most intense feeling I had ever experienced in my loins. I think I might have cried a bit even.
I couldn't remember anything except for the pleasure, but when it was over and I had emptied my entire life force into her tight passage, Katy was giggling again. She stroked my head and held me close against her as I stayed deep inside of her ass. I could have fallen asleep in that moment, if I had planned to stay here with her all night. I actually contemplated it, even if Adrienne would wonder why I had been down here so long. I could just tell her that we actually fucked, that I had successfully seduced my sister and we had finally done the deed.
Katy had other plans, though. She breathed softly in my ear.
"We didn't fuck," she said, "but we talked about sex and you think I might be ready to. I admitted that I masturbated to the memories of what we did as kids, and I was fine if you enjoyed recalling those times too. We didn't talk about fucking each other, but I did accept your offer to move here with the understanding that we would both be ok knowing each of us felt this way."
I started to withdraw from Katy's tight hole, but she held me in place.
"No, no," she said. "You're not going anywhere. Stay there. I like it."
I looked at her with a curious smile. "Really?"
She nodded. "Of course, why do you think I let you fuck me there?"
"I just thought you were humoring me."
"That's how it started," she admitted. "But after a bunch of times doing it, I started to like how it felt. I like how it feels wherever you fuck me. I'd eat your cum every time if that's what you wanted, or take it on my face, or anywhere you-"
I interrupted my sister with a kiss, and savored the taste of her saliva.
"You're amazing," I said afterward.